Adjustable bearing bush



3 and remachined as often as Patented Sept. 13, 1932 WILLY SCHARFF, FFRANKFORT-ON-THE-MAIN, GERMANY ADJUSTABLE BEARING BUSH My inventionrelates to adjustable bearing bushes. It is' an object of my inventionto a bush of this To this end I provide a tapering recess in the bush inconnection with the usual longitudinal slot, and insert a taperingfillet in the recess.

I-Ieretofore, shafts, quills, tail spindles and other'parts ofdrillpresses, lathes, grinding machines and the like, in which greatexactitude is permanently required, were supported in adjustable bushesmade of bronze and other alloys and the means for adjusting such bushescomprised a tapering face on the outside of the bushes which engaged acorresponding bore in the bearing, the bush being slotted longitudinallyand threaded at either end, and circular nuts being seated on thethreaded ends of the bush so as to force it into 9 its tapering seats.In order to obtain a goo fit of the' bush the wall thickness of which isgenerally considerable, it is provided with parallel flutes on theoutside which extend to a short distance from the inner face of thebush.

Bushes designed in this manner involve the drawback that stresses due toheat or forces cause irregular deformation in the region of thelongitudinal slot which are liable to bring about seizing of the bush onthe shaft or spindle. Various attempts have been made to overcomeprovide means for adjusting type without deformation.

slot but such jibs do not permit frequent readjustment of the bushes. Ithas also been attempted to replace the comparatively resilient jibs oflead or wood by comparatively rigid jibs which, however, must be removedI the bush is adjusted. This obviously involves not only labour and lossof time but also requires great exactitude and therefore this solutionis not satisfactory either. The solution of providing one or more wedgesin the slot which are adapted to be adjusted bymeans of separate screwsalso involves the drawback of complication, and besides it is necessaryto adjust the wedges separately after the bush has been reset so thattheadjustment of the bush equal to the conical bore in the d with a byinserting jibs of lead or hard wood in thecal bush adapted to be fittedin is often interfered with by the ad ustment of the wedges.

All these drawbacks are overc Application filed July 16, 1928, SerialNo. 293,020, and in Germany February 2, 1928.

subsequent ome in my invention which consists in providing a taperingrecess in the bush and inserting therein a tapering fillet or wedge. Thebe tapering throughout or length, for instance,

wise parallel. The tapering to fit the recess is of comparat materialsuch as steel and its the bush is fitted, and the conical bush may be aslong as limit within 'hich axially for adjustment.

at either end,

fillet or wedge len frame 1n which recess may only for part of its andotherively rigi 'th may be face of the the bearing, minus the the sleeveis displaced It is a particular feature of my invention that the angleof the tapering fillet or wedge is a definite function of the taper ofthe sleeve,

maintain the faces in position of said dand may be calculated therefromso as to fitting relation for any bush in its bearing.

In the drawing aflixed to this specification and forming part thereofwith my improved fillet or wed trat-ed diagrammatically by way ofexample.

In the drawing Fig. 1 is a longitudinal section, Fig. 2 is a plan view,and

Fig. 3 is an end elevation of the sleeve viewed from the left in Fig. 2,

Fig. 4 is a horizontal section bush in position, Fig. 5 is an elevation,Fig. 6 is a plan view, and

Fig. 7 is an end fillet or wedge, and

a bush equipped e is illusof a bearing elevation of the tapering Fi 8 isa diagram illustrating the calculatioii of the taper. Referring now amachine of any to the drawing, is is a coni I abcaring It of kind, a isa slot extending in the usual manner, I) is a recess at either side ofthe slot which may be designed with a taper 'through- 9 out or, asillustrated, is provided with tapering ends a and cl only and otherwiseparallel,

e are the usual flutes in the outer bush, these I and 4 for the sake ofsimplicity, is

face of the flutes being not shown in Figs. 2

', k are the I the position t on the-diameter D threaded ends of thebush k, m and n are the usual circular nuts on the threaded ends 0, cl,7 and g are the tapering ends of the fillet or wedge 1, Figs. 5, 6 and7, the angle of which is equal to the angle of the faces 0 and d, whilethe body of the fillet is parallel in accordance with the intermediatepartof the recessb. t l- Referring now to Fig. 4, this shows the bush 7cassembled in the bearing'h, with a shaft or other part 2' in the bush,the circular nuts m and n on the threaded ends is holding the bush inposition. It will also appear from this figure, that the fillet Z onlyengages the tapers c and d of the recess F) with its corresponding facesf and {1, but notthe intermediate parallel portion. V

If it is desired to re-adjust the bush after its inside diameter haswear, the nut m at the larger end of the bush is unscrewed and the nut nat its smaller end is set until the wear has been made up, and then thenut m is re-set. in the same position with respect to the hearing it andonly the bush l: is displaced with frirlaspect to the inclined faces fand g of the let.

It follows that my invention combines the been increased by'.

of the member in whichsaid bushing is used, the taper of the matingfaces of said wedge and said recess being so determined with respect tothe taper of said bushing as to maintain the faces in fitting relationfor any position of said bushing in its bearing.

2. An adjustable tapering bearing bushing having a longitudinal slot, arecess in said slot, tapering faces projecting inwardly from the Wallsof said recess, a Wedge in said recess of a length equal to thethickness of the member in which said bushing is used, and faces on saidWedge adapted to fit said inwardly projecting faces. the taper of thefaces on said wedge and in said recess being so determined with respectto the taper of said bushing as to maintain the faces in fittingrelation for any position of said bushing in its bearmg.

In testimony whereof I aflix my signature.

WILLY SCI-IARFF.

The fillet Z remains feature of extreme simplicity as to constructionand operation, permanent and rigid connection of its parts, andelimination'of any tendency of unintentional reduction of the insidediameter and consequently elimination of seizing.

Referring now to Fig. 8, D is the inside diameter of the bearing h atone end, d is its inside diameter at the other end, 03 is the outsidediameter of the bush k at its smaller end,

D is its outside diameter at its larger end after it has been shiftedfrom the position 0, p to the postion 9,1, for the distance a, and L isthe length of the hearing. The angle of the tapering faces f, g iscalculated by plotting the displacement of one end of the slot or, forinstance, the point 8 at the diameter D into after the bush has beendisplaced through a, and the width of the slot a has been reduced to nilalong the line y. The angle 0: which the line connecting the points aand t includes with the axis of the bush is the angle of the faces 7",9. With D and d, D and d given the taper of the bush in per cent of itslength is readily determined and from the displacement z and the taperthe angle 0: is calculated.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

I claim 1. An adjustable tapering bearing bushing having a longitudinalslot, a tapering recess in connection with said slot, and a wedge insaid recess of a length equal to the thickness

